Communication Terminal and Communication Network System

1. A communication terminal capable of dynamic reconfiguration of its connection method, including presence/absence of a connection, to a plurality of wireless communication networks, comprising: a data communication aggregation device, at least one communication application executing device, and a local communication path for communications between the data communication aggregation device and the communication application executing device, characterized in that: the data communication aggregation device is provided with: a single or a plurality of communicating means corresponding to the plurality of wireless communication networks configured physically or logically; first local communication means for communicating with the communication application executing device through the local communication path; and a required value integration processing means for integrating values of communication parameters required in each of the at least one communication application executing device, wherein the values are aggregated and communication links selectively aggregated independently of the number of applications currently being executed; and the communication application executing device is provided with: second local communicating means for communicating with the data communication aggregation device through the local communication path; and application executing means for executing an application for communicating at least with an outside communication network; wherein the at least one communication application executing device includes a handheld user device, and the data communication aggregation device is separate from said handheld user device.

2. The communication terminal according to claim 1 , wherein the data communication aggregation device is provided with: a connection policy information table stored in storage means; communication network reconfiguration management means for selecting a connection method to a wireless communication network on the basis at least of the connection policy information table; and communication network reconfiguration executing means for reconfiguring connection to the selected connection method.

3. The communication terminal according to claim 1 , wherein communication network reconfiguration management means is provided with a connection policy information creation portion for creating a connection policy information table, using requirement information inputted from input means or stored in a storage means relating to a predetermined communication parameter in the wireless communication network, on the basis of the requirement information.

4. The communication terminal according to claim 3 , wherein said predetermined communication parameter is one of or combination of a communication speed, a communication amount, a line load, a packet loss rate, communication delay, jitter, radio-wave intensity, communication fee, or a value calculated by a predetermined calculation equation from values of these parameters.

5. The communication terminal according to claim 3 , wherein the data communication aggregation device is provided with a communication network measurement information collecting means for extracting at least any of information on said predetermined communication parameters from each wireless communication network; said communication network reconfiguration management means is provided with a connection policy information evaluation portion for evaluating contents of said connection policy information table on the basis of the information collected by the communication network measurement information collecting means; and said connection policy information creation portion updates said connection policy information table according to the evaluation.

6. The communication terminal according to claim 3 , wherein the data communication aggregation device is provided with frequency measuring means for measuring a use state of a frequency by each wireless communication network; and said connection policy information creation portion updates said connection policy information table according to the use state of the frequency.

7. The communication terminal according to claim 1 , wherein a plurality of communication application executing devices are provided in the data communication aggregation device in said communication terminal so that the data communication aggregation device operates for each communication application executing device.

8. A communication network system comprising: the communication terminal according to claim 1 ; said plurality of wireless communication networks; and a plurality of server devices connected through the wireless communication networks.

9. The communication terminal according to claim 1 , wherein the handheld user device is configured to communicate wirelessly with the data communication aggregation device.